Yanmar 1GM10 pump removal

[jerry_jones]

I have decided that I need to send my injector and pump for checking, and wonder if there are any known "gotchas" with removing/refitting the pump. I understand that pump timing is critical, and gather that this is adjusted by shimming. The handbook gives a procedure for checking the timing, but does ayone have any tips for me?

 

[jerry_jones]

Well, the injector comes out easily enough - don't be fooled by the flats on it - as soon as you have removed the retaining placte it is a push-fit into the head. The pump, however, is a different story. I removed the 3 nuts which retain the top, but it seems reluctant to move more than about 5mm and I am reluctant to be more brutal. Is there a clever techique? And can someone recommend a workshop manual? I assume Yanmar's is expensive.